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CMB-203-11C2N-B-A/20 Equivalent & Substitute Parts
Part Overview
The CMB-203-11C2N-B-A/20 is a thermal circuit breaker manufactured by Carling Technologies, rated for 20A at 250V AC and 32V DC. This single-pole, panel-mount device features push-to-reset actuation and holds Active product status. The breaker is designed for overcurrent protection in AC and DC applications requiring thermal response characteristics.
Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct functional replacement in circuit protection applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 20A |
| Voltage Rating - AC | 250V |
| Voltage Rating - DC | 32V |
| Breaker Type | Thermal |
| Mounting Type | Panel Mount |
| Actuator Type | Push to Reset |
| Number of Poles | 1 |
| Illumination | None |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the CMB-203-11C2N-B-A/20 are qualified based on the following critical parameters:
Electrical Equivalence:
- Current Rating: 20A (exact match required)
- Voltage Rating - AC: 250V (exact match required)
- Voltage Rating - DC: 50V (OptiFuse CBW57 series parts rated at 50V DC exceed the 32V DC requirement and remain compatible)
Mechanical Equivalence:
- Breaker Type: Thermal (exact match required)
- Mounting Type: Panel Mount (exact match required)
- Actuator Type: Push to Reset (exact match required)
- Number of Poles: 1 (exact match required)
Compliance:
- RoHS3 Compliant status confirmed for all substitute parts
- All substitute parts hold Active product status
The OptiFuse CBW57 series parts listed below satisfy all critical substitution criteria. The higher DC voltage rating (50V versus 32V) on substitute parts provides enhanced capability without compromising compatibility in applications designed for the original 32V DC specification.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Current Rating (A) | Voltage AC | Voltage DC | Breaker Type | Mounting | Actuator | Poles | RoHS Status | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|
| CMB-203-11C2N-B-A/20 | Carling Technologies | 20 | 250V | 32V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-EJ-20A | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-EL4-20A | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-ES-20A | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-ES-20A-5H | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-ES-20A-5X | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-HS-20A-5X | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-HS-20A-C | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-PB-20A-WX | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-PF-20A-5X | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
| CBW57-PL-20A-5X | OptiFuse | 20 | 250V | 50V | Thermal | Panel Mount | Push to Reset | 1 | ROHS3 Compliant | Active |
Engineering Selection Recommendations
All listed OptiFuse CBW57 series parts are qualified substitutes for the CMB-203-11C2N-B-A/20 based on electrical and mechanical parameter alignment. Selection among substitute parts should be based on:
Regulatory Compliance: The CMB-203-11C2N-B-A/20 carries CE, cUL, TUV, UL1077, and UL1500 certifications. OptiFuse CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. Both product lines maintain Active status and ROHS3 compliance.
Availability: Inventory levels vary across substitute part numbers. CBW57-ES-20A-5H maintains the highest inventory at 2,458 units. CBW57-PL-20A-5X maintains the lowest inventory at 862 units.
DC Voltage Capability: All OptiFuse substitutes are rated for 50V DC, exceeding the original 32V DC specification. This enhanced rating does not affect compatibility in applications designed for 32V DC operation.
Moisture Sensitivity: OptiFuse CBW57 series parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.
Frequently Asked Questions (FAQ)
Q: Can OptiFuse CBW57 series parts directly replace the Carling Technologies CMB-203-11C2N-B-A/20?
A: Yes. All listed OptiFuse CBW57 series parts meet the critical electrical parameters (20A, 250V AC) and mechanical specifications (thermal, panel mount, push to reset, single pole) required for direct substitution.
Q: Why do OptiFuse substitute parts have a higher DC voltage rating (50V) than the original part (32V)?
A: The higher DC voltage rating on OptiFuse parts represents enhanced capability. Parts rated for 50V DC are fully compatible with applications designed for 32V DC operation, as the higher rating provides additional safety margin without affecting circuit protection function.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed OptiFuse CBW57 series substitute parts carry ROHS3 Compliant status, matching the environmental compliance of the original CMB-203-11C2N-B-A/20.
Q: What is the difference between the various OptiFuse CBW57 part number suffixes?
A: The suffixes (EJ, EL4, ES, HS, PB, PF, PL) indicate different connector or terminal configurations within the CBW57 series. All variants maintain identical electrical ratings and thermal protection characteristics. Selection should be based on mechanical interface requirements specific to the application.
Q: Do substitute parts carry the same regulatory certifications as the original?
A: Both the original CMB-203-11C2N-B-A/20 and OptiFuse CBW57 substitutes carry UL 1077 and UL 1500 certifications. The original part carries additional CE, cUL, and TUV certifications, while OptiFuse parts carry cURus, IP 40, and SAE J1171 certifications. Application requirements should determine if specific certifications are mandatory.
Q: What is the MSL rating for OptiFuse CBW57 parts?
A: OptiFuse CBW57 series parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints. These parts can be stored and handled without special moisture control measures.
Q: Are substitute parts available in bulk packaging?
A: Yes. All listed OptiFuse CBW57 series substitute parts are supplied in Bulk packaging, consistent with standard circuit breaker distribution formats.
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